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#!/usr/bin/env lua
--[[
Challenge 098
TASK #1 � Read N-characters
Submitted by: Mohammad S Anwar
You are given file $FILE.
Create subroutine readN($FILE, $number) returns the first n-characters and
moves the pointer to the (n+1)th character.
Example:
Input: Suppose the file (input.txt) contains "1234567890"
Output:
print readN("input.txt", 4); # returns "1234"
print readN("input.txt", 4); # returns "5678"
print readN("input.txt", 4); # returns "90"
--]]
files = {}
function readN(filename, n)
local file = files[filename]
if file == nil then -- file not yet open
file = io.open(filename, "r")
files[filename] = file
end
local text = ""
for i=1,n do
local c = file:read(1)
if c ~= nil then
text = text..c
end
end
return text
end
for i=1, #arg-1, 2 do
text = readN(arg[i], arg[i+1])
io.write(text, "\n")
end
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